Engine light says egr problems

Ive been having problems with my truck for a while. Sometimes it idles rough and I loose my rpm`s often when I am driving. So I hooked a computer up and it says something is wrong with my EGR. I took the EGR valve off, cleaned it, put it back on, tested it and it passed. But the computer says I still have a problem with the EGR. So I decided to replace the EGR vaccuum selanoid and it dint help at all. The EGR valve works and so dose the EGR vaccuum selanoid. What else could it be?

I would still try to change your egr!!! sometimes egr test good but still they can stick open and that can cause idle problems so if you want to get your prob fix change egr valve
take that egr off and put in a new one !!!!

Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.

Related Questions:

I hate to be the bearer of bad tidings, BUT... it\'s obvious that these corrections you\'ve made [lots of $$$$$] have nothing to do with your problem.

Quite OFTEN idle and low speed engine performance problems are CAUSED by LEAKS in the VACUUM lines/system!!!!!

As a vehicle ages, summer heat, as well as engine heat, will cause the rubber or plastic of vacuum lines to deteriorate and either crack or become loose in their connection to nipples and tees in the vacuum system. This allows EXTRA AIR into the engine.

In the early stages of this process, the engine computer will be able to correct for the EXTRA AIR being sucked into the system.

However, as the air leakage increases with time and heat, the computer cannot fully correct, and thus engine performance suffers.

One fix is to replace all vacuum system components, BUT... that will COST HUNDREDS OF DOLLARS!!!!!

The way I have used to FIND vacuum leaks is to use a TINY PLUME of Propane from a small torch.

With the engine idling, gently open the Propane torch valve, "cracked" open just enough to be able to smell the Propane [DO NOT IGNITE/light the Propane, we only want a VERY small amount of gas, but NO FLAME!!!!!].

Then, apply the invisible tiny jet of Propane to EACH connection point in the vacuum system, while the engine is idling.

The engine idle speed [RPM] and sound should remain unchanged IF there is no leak at that connection.

HOWEVER, IF there IS a LEAK, the engine idle RPM and sound will change, and this is indicative of a leak at that point.

Once, when out of Propane, I substituted WD-40, and that worked also!

I suspect that any gas, either a combustible fuel gas, OR even a non-combustible gas would work because either would change the air [Oxygen] to vehicle fuel ratio, thus changing the idle RPM.

I have a 2000 Isuzu Trooper that had a PO401 code that would reset and then 2 miles later the light was on again - I found if you remove the EGR valve and start the engine that the engine should idle rough - If it doesnt and you have vacumn at the intake port spray carb cleaner down the port slowly and see how long it takes for the engine to run rough - Keep spraying till the engine dies and spray some more down the passage and let the engine set for 5 minutes and then restart the engine - it will run rough at first but clear out - you should be able to feel the engine RPM change when you put your finger over the intake vaccumn port for the egr - If not then repeat the cleaning method again - If you do feel the rpm change then put the egr valve back on and clear the code and run your drive cycle to see if it is fixed.

have you checked the EGR (exhaist gas recirculation) valve? sometimes carbon will chip off and make them stick partially open causing extremely rough idle or wont idle at all without help from throttle

You have a vacume leak somewhere. You can try to listen for it or you can get a can of brake parts cleaner and spray it around the engine. Anywhere there is hoses or connections of any kind. When you find the leak the engine RPM's will increase. If thats not the problem it could be your EGR valve is clogged or your map sensor could be bad. Those things would usually cause a check engine light. Vacume leaks wont. Good luck